The diagram shows a heater above a thermometer. The thermometer bulb is in the position shown.
Which row shows how the heat energy from the heater reaches the thermometer bulb?

1 )
conduction:yes / convection:yes / radiation:no
2 )
conduction:yes / convection:no / radiation:yes
3 )
conduction:no / convection:yes / radiation:no
conduction:no / convection:no / radiation:yes
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